SAN FRANCISCO (CBS SF) — California Highway Patrol investigators were searching for a driver who fatally struck a man walking on the Bay Bridge late Tuesday night.

The CHP said officers responded to calls of a pedestrian walking on the Bryant Street onramp toward the lower level of the highway at around 11:10 p.m.

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Minutes later calls came in reporting that the man was walking in the right-hand eastbound lanes of traffic on teh bridge near 5th Street and had entered the left-hand lane blocking traffic.

An 11:18 p.m. call reported that he been struck by at least one vehicle maybe several others. Video shot at the scene shows several vehicles pulled over.

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Investigators said at least one vehicle fled the scene. They were examining bridge security cameras to gather information on the sequence of the fatal incident.

Officers closed the No. 1 and No. 2 lanes and San Francisco Fire Department responders provided life support measures, but the person was pronounced dead at the scene at 11:23 p.m.

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The identity of the man was being withheld until his next-of-kin is notified. The incident remains under investigation. Lanes on the bridge were reopened early Wednesday.